diff --git a/templates/mod/ban_form.html b/templates/mod/ban_form.html
index dbcfedae..3ddc6341 100644
--- a/templates/mod/ban_form.html
+++ b/templates/mod/ban_form.html
@@ -30,10 +30,11 @@
 					<select name="range">
 						<option value="">no range ban</option>
 						{% for i in range(29, 12) %}
-							<option value="/{{i}}">/{{i}}</option>
+							<option value="/{{i}}">/{{i}} (covers {{2**(32-i)}} addresses)</option>
 						{% endfor %}
 					</select>
 				{% endif %}
+				<p class="unimportant hint">{% trans %}Be careful with range bans. The bigger the range, the more likely it will affect users you didn't intend.{% endtrans %}</p>
 			</td>
 		</tr>
 		<tr>